Skip to main content
Free Delivery  ·  COD Available  ·  15-Day Returns
Elecvora
DFRobot Gravity Analog CO/Combustible Gas Sensor MQ9 — image 1
Hover to zoom

1 / 4 · Click to enlarge

DFRobot

DFRobot Gravity Analog CO/Combustible Gas Sensor MQ9

25+ bought in past month
AI Summary
DF Robot Modules for everyday users

The DFRobot Gravity Analog CO/Combustible Gas Sensor MQ9 by DFRobot is a value-for-money df robot modules designed for everyday users. It features Sensor Type: Semiconductor and Power Supply Voltage (V): 5.

₹1,469
Free Shipping💵 COD Available

Available Offers

Free Delivery on this order. No minimum order value.

15-Day Easy Returns — hassle-free return & full refund.

Secure Payment — 100% safe checkout with UPI, Cards & Net Banking.

Total: ₹1,469
Buying tip: A well-rounded choice at a fair price. Recommended for most buyers.
Estimated delivery: 25 Aug8 Sept
Free Shipping
Pan India delivery
15-Day Returns
Hassle-free policy
Secure Payment
Razorpay protected
Quality Assured
Vetted products only

Available Offers

💳

5% Cashback

Pay with UPI & get 5% cashback (up to ₹50) via Razorpay

🏦

No-Cost EMI

Available on select bank cards at checkout. 0% interest for 3 months.

📦

Free Shipping

Free delivery on all orders. No minimum order value.

💵

Cash on Delivery

COD available on orders up to ₹5,000 across India.

Quick Specs

Sensor Type: Semiconductor
Power Supply Voltage (V): 5
Interface: Analog
Loop Voltage(Vc): ≤10V
Heater Resistance: 31±3Ω
Sensor Resistance: 2KΩ-20KΩ(in 100ppm CO)

Ideal For

Electronics projectsArduino / Raspberry Pi buildsPrototyping
Share:
SKU: robu-1356231Category: DF Robot Modules

About This Product

The DFRobot Gravity Analog CO/Combustible Gas Sensor MQ9 by DFRobot is a value-for-money df robot modules designed for everyday users. It delivers reliable performance at an accessible price.

Key Specifications

  • Sensor Type: Semiconductor
  • Power Supply Voltage (V): 5 — works with standard household power
  • Interface: Analog — compatible with modern devices
  • Loop Voltage(Vc): ≤10V — works with standard household power
  • Heater Resistance: 31±3Ω
  • Sensor Resistance: 2KΩ-20KΩ(in 100ppm CO)
  • Humidity Range: 65%±5%RH — reliable connection even at a distance
  • Dimensions (L x W x H) mm: 36.4x26.6

Why Buy from Elecvora?

Elecvora sources this product directly, cutting out multiple middlemen. Every order includes free shipping, a 15-day return policy, and secure payment via Razorpay.

This is an Arduino CO/Combustible Gas sensor. It uses MQ-9 to detect Carbon Monoxide. The sensor can be used to detect different gases containing CO and combustible gases, it is low cost and suitable for a variety of applications. The core sensing material of the MQ-9 gas sensor is SnO2, which has lower conductivity in clean air. It makes detection by cycling high and low temperatures and detects CO when low temperature (heated by 1.5V). The sensor’s conductivity is higher along with the gas concentration rising. When temperature rises (heated by 5.0V), it detects Methane, Propane, combustible gas, etc, and cleans the other gases adsorbed under low temperature.

The sensitivity can be adjusted by the potentiometer. The output is proportional to the density of a gas. You can use analog reading to read the data from this sensor.
Applications:
  1. Domestic gas leakage detector
  2. Industrial gas detector
  3. Portable gas detector

Features:

  1. Good sensitivity to CO/Combustible gas
  2. High sensitivity to Methane, Propane and CO
  3. Long life and low cost
  4. Simple drive circuit
  5. Heater consumption: ≤350mW
  6. Sensing Resistance: 2KΩ-20KΩ(in 100ppm CO )
  7. Sensitivity: Rs(in air)/Rs(100ppm CO)≥5
  8. Concentration:10-1000ppm CO ,00-10000ppm combustible gas
  9. Good sensitivity to CO/Combustible gas
  10. Slope: α ≤0.6(R300ppm/R100ppm CO)
  11. Tem. Humidity: 20℃±2℃; 65%±5%RH
  12. High sensitivity to Methane, Propane and CO

Package Includes:

1 x DFRobot Gravity Analog CO/Combustible Gas Sensor (MQ9) For Arduino  

Setup Guide

1
Identify the pins
Locate VCC (power), GND (ground), and data pins (SDA/SCL for I2C, MOSI/MISO for SPI, or TX/RX for UART). Refer to the pinout diagram on the product page.
2
Wire to your microcontroller
Connect VCC to 3.3V or 5V (check the module spec), GND to GND, and data pins to the appropriate GPIO pins on your Arduino or Raspberry Pi.
3
Install libraries
In Arduino IDE, go to Sketch → Include Library → Manage Libraries and search for the sensor library. Install the recommended version.
4
Upload example sketch
Open File → Examples → [library name] → Basic Example. Upload to your board and open Serial Monitor to view output.
5
Calibrate if needed
Some sensors (temperature, humidity, distance) may need a short warm-up period or calibration. Run the calibration sketch if provided.